BMI Result: 6ft 6in, 155 lbs (BMI 17.9) - Female
According to CDC and WHO standards, a BMI of 17.9 is classified as Underweight.
A female who is 6ft 6in tall and weighs 155lbs has a BMI of 17.9, which falls into the Underweight category used by the CDC and WHO for adults.
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Underweight | < 18.5 |
| Obese | ≥ 30 |
Healthy weight range for 6ft 6in: 160 lbs – 216 lbs
Metric: 198.1 cm, 70.3 kg
📏 Healthy waist circumference for your height: 30" – 35" (below 35" for female)
So you're 6ft 6in and weigh 155lbs. Your BMI is 17.9, which falls into the Underweight category according to CDC and WHO standards. Let's break down what this means for your health.
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Understanding Your BMI
A BMI below 18.5 may indicate nutritional insufficiency. According to the CDC, this range is associated with increased risk of bone density loss and immune function decline. Consulting a healthcare provider is recommended for a thorough nutritional assessment.
What This Means for Your Height
For women over 5ft 11in, BMI may slightly underestimate body fat due to higher bone density. Muscle mass is also a factor—consider body fat percentage as a complementary measure.
Weight & Threshold
Gaining approximately 5.2 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 5.2 lbs would put you in the Normal BMI range.
Waist & Health
The CDC recommends that non-pregnant women keep waist circumference below 35 inches. A waist-to-height ratio below 0.5 is also associated with lower health risks.
Age Context
For adults 45-64, metabolic health becomes increasingly important. At 55 years old, a woman at 6ft 6in and 155lbs has a BMI of 17.9, which falls into the Underweight category.
For adults in this age range, maintaining stable weight and regular physical activity is key to preserving metabolic health.
👉 Calculate your Body Fat Percentage for a more complete health assessment.
👉 Try our Athlete BMI Calculator if you have higher muscle mass.
Health Analysis
Recommendations
General Health
A BMI of 17.9 is below the CDC and WHO healthy range of 18.5-24.9. This may indicate nutritional insufficiency. Consulting a healthcare provider is recommended for a thorough nutritional assessment.
Monitoring
In addition to BMI, pay attention to waist circumference. The CDC recommends females stay under 35 inches. Regular tracking of your measurements over time provides the most useful insight into your health trends.
Next Steps
If you're concerned about your weight or body composition, a healthcare provider can offer personalized guidance based on your full health profile.
Personalized Notes
Health Risks
With a BMI of 17.9 for a 6ft 6in woman, the underweight range is associated with increased risk of bone density loss and immune function decline. Consulting a healthcare provider is recommended for a thorough nutritional assessment.
Physical Activity
For a woman at 6ft 6in, light strength training 2-3 times per week can help build muscle mass. Avoid excessive cardio which burns additional calories. The CDC recommends consulting a healthcare provider before starting any new exercise program.
Frequently Asked Questions
Is 155lbs overweight for a 6ft 6in woman?
What percentage of women have a BMI of 17.9 at 6ft 6in?
What is the BMI for a 6ft 6in woman at 155lbs?
What health risks are associated with a BMI of 17.9 for a 6ft 6in woman?
Related Tools & Articles
💡 About this calculation: BMI = (155 × 703) ÷ (78 × 78) = 17.9 | Metric: 198.1 cm, 70.3 kg
📖 Recommended reading:
Editorial Review: This page was generated by the BMI Calculator Web Editorial Team and reviewed at template and content-pool level for accuracy and guideline alignment by Dr. Sarah K. Johnson, PhD, RD. All content is aligned with current WHO, CDC, and NIH guidelines.
Published: 2026-10-13